To be fair, if someone is going to develop severe depression due societies issues with covid, and they become suicidal, it's a complicated thing and lots of people can take months to years to carry out their choice to make an attempt on their life. This happened with a couple people in my life whom I've lost, they take a year or more to come up with a plan, decide what things have to be just right before doing it, while in the mean time, hiding what their intentions are.
Just because suicide rates dropped a bit, does it mean that it's not a budding issue. It could just mean that people having this battle, could be spreading out the numbers over the next few years.
If drug and alcohol abuse level rise, suicides and overdoses could very well rise, but we see those numbers pop up over the next 1-5 years (hypothetically).